/**
 * Copyright (c) 2010, Casey Lai
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 * 
 * Neither the name of the Cheetah Group nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

package org.cheetahworkflow.designer.policy;

import org.cheetahworkflow.designer.command.AddNodeCommand;
import org.cheetahworkflow.designer.command.AdjustNodeCommand;
import org.cheetahworkflow.designer.model.Chart;
import org.cheetahworkflow.designer.model.Node;
import org.cheetahworkflow.designer.part.NodePart;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.editpolicies.XYLayoutEditPolicy;
import org.eclipse.gef.requests.CreateRequest;


public class ChartLayoutEditPolicy extends XYLayoutEditPolicy {
	
	@Override
	protected Command createAddCommand(EditPart child, Object constraint) {
        return null;
    }

	@Override
	protected Command createChangeConstraintCommand(EditPart child, Object constraint) {
		if (!(child instanceof NodePart) || !(constraint instanceof Rectangle)) {
			return null;
		}
		
		Rectangle rect = (Rectangle) constraint;
		return new AdjustNodeCommand((Node) child.getModel(), rect.getLocation(), rect.getSize());
	}

	@Override
	protected Command getCreateCommand(CreateRequest req) {
		if (req.getNewObject() instanceof Node) {
            AddNodeCommand cmd = new AddNodeCommand(
            		(Chart) getHost().getModel(),
            		(Node) req.getNewObject(),
            		((Rectangle) getConstraintFor(req)).getLocation());
            return cmd;
        }
        return null;
	}

	@Override
	protected Command getDeleteDependantCommand(Request request) {
        return null;
    }
}
